Problem after upgrade to php 5.3

I have problem with domain www.bojleri.net

when I click on the next link www.bojleri.net/component/k2/item/1?Itemid=225 there is nothing.

Before work fine, but after update to php 5.3 there is problem.

In admin back-end, in global configuration, set "Error reporting" to Maximum. Then browse page to see if some messages will pop out. If yes post them here.

Remember to return "Error reporting" to original value

in the home page www.bojleri.net/ :

Notice: Undefined variable: query in /home/rentacar/public_html/bojleri.net/plugins/system/jvcounter/jvcounter.php on line 94

in the www.bojleri.net/component/k2/item/1?Itemid=225 :

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 82 bytes) in /home/rentacar/public_html/bojleri.net/libraries/joomla/database/database/mysqli.php on line 498

There is some infinite loop in component you use called 'jvcounter', that's it